Workers who clean trains on two of the country's busiest rail routes are to stage a 24-hour strike over "scandalous" low pay.
RMT union members employed by contractors ISS on East Coast and London Midland will walk out on Monday September 10.
The cleaners voted massively in favour of industrial action after the union said no pay rise was being offered for three years.
RMT general secretary Bob Crow said: "The scandal of low pay on two of the country's busiest and most prestigious rail routes continues with ISS assuming that it can get away with exploiting workers who are key to delivering high-quality services.
"The rail companies East Coast and London Midland also have a moral responsibility to ensure that the people who work on their contracts are treated decently and it is no good hiding behind the shabby excuse that cleaners' pay is a matter for the contracting companies."